class Settings():
	"""存储游戏《外星人入侵》中所有设置的类"""
	def __init__(self):
		"""初始化游戏设置"""
		self.screen_width = 1200
		self.screen_height = 800
		self.bg_color = (230, 230, 230)

		self.ship_speed = 4

		self.bullet_speed = 1.0
		self.bullet_width = 3
		self.bullet_height = 15
		self.bullet_color = (30, 30, 30)